Can I point out that that attitude is precisely why Hitler (or you) could not be trusted by FDR and the US? And why any Agreement reached with you or Nazi Germany would be meaningless. So would not be contemplated by the USI am not saying it was necessarily morally right to take Czechia but there were good strategic reasons for doing that other than just land grabing and politics is not a moral game. Having a foreign state bulge into your territory like Czechoslovakia did is a great risk in the long term unless that state is an ally which CS was not. I actually think a lot of other statesman would have done the same in that situation.
Munich was meant to be Peace in Our Time remember.